<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <link rel="stylesheet" href = "//cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" />
</head>

<body>

<div class="container">
  <img src="./img/icon.png" />
</div>

<!-- single quotes -->
<script src:'//cdn.bootcss.com/jquery/3.1.0/jquery.min.js'></script>

<script src="//cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.html"></script>

<script src="./example1.js?code=utf-8"></script>

<!-- single quotes -->
<script src='example.js?from=wx&code=utf-8'></script>
'example.js'
</body>

</html>